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Transcript
Name _____________________________________________ Date ______________ Cell Cycle Internet Activity (Version 2) Directions: In this activity, you will calculate the lengths of the various phases of the cell cycle in an onion root tip. First you will view some slides and graphics of onion root tips provided by the Molecular Expressions Photo Gallery. Then you will complete the online activity provided by the Biology Project at the University of Arizona. Use your browser to go to Online Onion Root Tips at http://www.biology.arizona.edu/cell_bio/activities/cell_cycle/assignment.html. Begin by reading the description of the five major cell phases. You will need to keep this information in mind during the activity. You may also use your text book and refer to pages 64 and 65. Proceed through the activity, identifying the phase for each cell you are shown. Pay attention to the hints if you misidentify a cell at first. To calculate the percentage, use the online calculator at www.calculator.com/ Example: Number of cells in the Phase × 100 36 (Total Number of Cells) . ONION ROOT TIPS AND THE CELL CYCLE When you have completed the activity, answer the questions that follow. Interphase Number of cells Percent of cells Prophase Metaphase Anaphase Telophase Total Questions: 1. What percent of cells were in interphase? 2. What percent were in mitosis? 3. Which phase of mitosis takes the longest? 4. During which stage is the nucleolus visible as a dark spot? 5. How can you recognize a cell in metaphase? 6. Which stage of the cell cycle would you expect the cell to be in at any given timeinterphase, mitosis, or cytokinesis. Explain. Summary Paragraph: Write a 4-5 sentence summary describing what you learned from completing this activity. Use the answers to your questions to help formulate the summary.